Resuscitate OpenCL interface
Description
Fix the code compilation and run with OpenCL. The interface to the Tuned CLBlas (cblast) interface is added, as CLBlas was removed from Debian Bull Eyes. Some kernel are fixed as the arguments where not correct.
Other minor fixes and improvements.
Closes #566 (closed)
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.
Edited by Nicolas Tancogne-Dejean